[analyzer] Add test case for handling of __bridge_transfer that previously resulted in a 'stack address' warning (that was fixed in r138616). Fixes <rdar://problem/10018376>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@138710 91177308-0d34-0410-b5e6-96231b3b80d8

test/Analysis/objc-arc.m

@@ -147,3 +147,9 @@ void test_objc_unretainedObject() {
   (void) x;
 }
 
+// Previously this resulted in a "return of stack address" warning.
+id test_return() {
+  id x = (__bridge_transfer id) CFCreateString();
+  return x; // no-warning
+}
+